Importing of tables without permission to view is possible

We have a base, in which I have been granted access to two of four tables. The other two tables contain some kind of confidential information not for my eyes. However, when I create a new base and start to import a table, from the original base, it is indeed possible to import the tables, I am not allowed to see.

How to stop this option?

I can confirm the issue.

You can solve it as follows: in the base with the shared tables open the Security Settings (click in the base header on the three dots next to Plugins, then Settings).
Then under “Shared users” select the option “Can not copy base to other groups”.

Now the import of a table from another base is prevented.